Q on frame rate synchronization

pmikep

Senior Member Joined: Nov 26, 2016 22:51 Messages: 285 Offline

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Sep 10, 2017 23:04

So, I use Screen Recorder primarily to record old TV movies, either off the air (USB stick) or off a web browser (DirecTVNow).

Since film was recorded at 24 fps, I presume what I'm seeing on my computer screen is also 24 fps.

So, does that mean I should set Screen Recorder for 24 fps?

I have in the past, without issue. But it seems like 29.97 is more fluid, altough I don't know how that can be.

I got to thinking tonight about synchronization. When I'm recording a 24 fps movie at 24 fps, what guarantees that the frames match, top to top?

Maybe it doesn't matter. I mean, suppose I start out by catching a half frame of movie. Each new frame will start at the same half frame and appear continuous.

Thoughts?

tomasc

Senior Contributor Joined: Aug 25, 2011 12:33 Messages: 6464 Offline

Sep 10, 2017 23:33

Film ota broadcast in the USA is 29.97 fps using a 3:2 pulldown. It can also be 59.94 fps. Use the usb stick tuner supplied software and you can’t go wrong or use the wmc if you are not using win 10. You can record video from the internet if you find the right software.

pmikep

Senior Member Joined: Nov 26, 2016 22:51 Messages: 285 Offline

Sep 10, 2017 23:48

Ahh... The 29.97 broadcast would explain why recording at 29.97 looks better. I didn't know they were using 3:2 pull down. If I have it right from the Resolve forum, 3:2 adds an extra duplicate frame every now and then?

As I think about it more (and read an article on telecine), I recall that, when I was in jr high, we got a field trip to the WGN TV studios. I remember seeing them projecting a film movie on a screen, with a television camera aimed at the screen. (Or on the back side of the screen.) Now I wonder if they just broadcast it directly or if there was some post-processing after the camera.

This message was edited 2 times. Last update was at Sep 11. 2017 01:10